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Finding the Fourth Proportional to 313.87, 471.09 and 217.75

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Solution

The fourth proportional to 313.87, 471.09 and 217.75 is: 326.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.87 : 471.09 = 217.75 : x
  2. Step 2: Convert to fraction form
    313.87/471.09 = 217.75/x
  3. Step 3: Cross multiply
    313.87x = 471.09 × 217.75
  4. Step 4: Simplify right side
    313.87x = 102,578.76
  5. Step 5: Solve for x
    x = 102,578.76/313.87
  6. Step 6: Final answer
    x = 326.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.